摘要:

Stress fracture in the world class athlete: a case study.Med. Sci. Sports Exerc.,Vol. 30, No. 6, pp. 783-787, 1998. Stress fracture presents a difficult problem in the high performance, world-class athlete. Competitive demands provide little tolerance for, or agreement with, prolonged periods of rest which are the first line of conservative treatment methods. The use of a specifically programmed, pulsed, low-intensity ultrasound device to shorten the time of healing was investigated in a well-known gymnast with an Olympic deadline. Prior animal,in vitro,and clinical studies had established the safety and effectiveness of this device in fractures. The location of the stress injury was in the mid-tibia which is considered to present the greatest challenge to an early healing result. The low-intensity ultrasound device was prescribed for daily use at home. At 3 wk after the start of low-intensity ultrasound, the stress fracture responded well and the patient was allowed use of tumble track, trampoline, and to do some weight-bearing activities, such as jumping in the pool and loading-type activities. At 4.5 wk, the patient progressed to full workout activities and participated in a trial meet for the Olympics. At 6 wk, the patient's participation in the women's gymnastic team event was a factor in the United States receiving a gold medal.

ISSN:0195-9131    

出版商:OVID    

年代:1998

数据来源: OVID

摘要:

Effect of glutamine supplementation on changes in the immune system induced by repeated exercise.Med. Sci. Sports Exerc.,Vol. 30, No. 6, pp. 856-862, 1998. The ability of lymphocytes to proliferate and generate lymphokine activated killer (LAK) cell activityin vitrois dependent on glutamine. In relation to intense exercise the lymphocyte concentration, the proliferative response, the natural killer and LAK cell activity, and the plasma glutamine concentration decline. It has been hypothesized that in relation to physical activity a lack of glutamine may temporarily affect the function of the immune system.Purpose:The purpose of this study was to examine the influence of glutamine supplementation on exercise-induced immune changes.Methods:In a randomized cross-over placebo-controlled study, eight healthy male subjects performed three bouts of ergometer bicycle exercise lasting 60, 45, and 30 min at 75% of their V˙O2maxseparated by 2 h of rest.Results:The arterial plasma glutamine concentration declined from 508 ± 35 (pre-exercise) to 402 ± 38 μM (2 h after the last exercise bout) in the placebo trial and was maintained above pre-exercise levels in the glutamine supplementation trial. The numbers of circulating lymphocytes and the phytohemagglutinin-stimulated lymphocyte proliferative response declined 2 h after, respectively, during each bout of exercise, whereas the LAK cell activity declined 2 h after the third bout. Glutamine supplementationin vivo,given in the described doses at the specific times, did not influence these changes.Conclusion:The present study does not appear to support the hypothesis that those aspects of postexercise immune changes studied are caused by decreased plasma glutamine concentrations.

ISSN:0195-9131    

出版商:OVID    

年代:1998

数据来源: OVID